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newObj not using the right constructor #3

davidfletcher opened this Issue Jul 8, 2012 · 4 comments

4 participants


I was trying to use newObj "Image" to get an HTML Image object, but the object that was created wasn't a proper Image. It was an object but it was mostly empty.

I think the problem is in primMkObj - it's doing

return new primGetCtor(nm);

I think what's happening is the new here is treating primGetCtor itself as the constructor function, and the actual constructor that primGetCtor returns is just being ignored.

I can fix it by adding parentheses:

return new (primGetCtor(nm))
rubendg commented Jul 20, 2012

I think what you are trying to do is:

foreign import js "new Image()"
newImage :: IO a

This is equivalent to: "new Image()".

UU CS Department member

I have modified the def of primMkObj, added the parenthesis.

UU CS Department member
spockz commented Aug 27, 2012

@davidfletcher: can you confirm that it works now as you intended?


Yes, looks like it works now - thanks.

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